package com.atguigu.gmall.realtime.app.dwd.db;

import com.atguigu.gmall.realtime.utils.MyKafkaUtil;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;

/**
 * @author Felix
 * @date 2023/12/22
 * 交易域：加购事实表
 */
public class DwdTradeCartAdd {
    public static void main(String[] args) {
        //TODO 1.基本环境准备
        //1.1 指定流处理环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        //1.2 设置并行度
        env.setParallelism(4);
        //1.3 指定表执行环境
        StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env);
        //TODO 2.从kafka的topic_db主题中读取数据创建动态表
        tableEnv.executeSql(MyKafkaUtil.getTopicDbDDL("dwd_trade_cart_add_groupo"));
        // tableEnv.executeSql("select * from topic_db").print();
        //TODO 3.过滤出加购行为   table='cart_info' and type='insert'|'update'
        Table cartInfo = tableEnv.sqlQuery("select\n" +
            "    `data`['id'] id,\n" +
            "    `data`['user_id'] user_id,\n" +
            "    `data`['sku_id'] sku_id,\n" +
            "    if(`type`='insert',`data`['sku_num'],cast((CAST(`data`['sku_num'] AS INT) - CAST(`old`['sku_num'] AS INT )) as string)) sku_num,\n" +
            "    ts\n" +
            "from topic_db\n" +
            "where `table`='cart_info' and (`type`='insert' or (`type`='update' \n" +
            "and `old`['sku_num'] is not null and \n" +
            "CAST(`data`['sku_num'] AS INT) > CAST(`old`['sku_num'] AS INT)))");
        // cartInfo.execute().print();
        tableEnv.createTemporaryView("cart_info",cartInfo);

        //TODO 4.将加购数据写到kafka主题中
        //4.1 创建动态表和要写入的主题进行映射
        tableEnv.executeSql("CREATE TABLE dwd_trade_cart_add (\n" +
            "  id STRING,\n" +
            "  user_id  STRING,\n" +
            "  sku_id STRING,\n" +
            "  sku_num STRING,\n" +
            "  ts STRING,\n" +
            "  PRIMARY KEY (id) NOT ENFORCED\n" +
            ")" + MyKafkaUtil.getUpsertKafkaDDL("dwd_trade_cart_add"));
        //4.2 写入
        tableEnv.executeSql("insert into dwd_trade_cart_add select * from cart_info ");
    }
}
